sannyasas tu maha-baho
duhkham aptum ayogatah
yoga-yukto munir brahma
"Gyana yoga without Karma yoga cannot make one happy. But a person engaged in devotional service can achieve the Supreme without delay."
Sanyasas tu = whereas Gyana yoga, aptum = attaining is, dukham = misery or sorrow, ayogatah = without Karma yoga. It means, that to get atman sakshatkaram, Gyana yoga needs Karma yoga. Otherwise it is full of sorrow or it is impossible. But, yoga = Karma yoga, yukto = one, who practices, muni = like a sage or who has controlled the mind. A Karma yogi always thinks of atman's qualities and so is able to control. Such a person, na cirena = within a short time, adhigacchati = attains, brahma = atman darshan or atman sakshatkaram. So Karma yogi gets the result easily and quickly, while Gyana yogi has to struggle hard and attains after pretty long time. Karma yoga is inevitable for Gyana yogi, but Karma yogi does not need Gyana yoga. Because while practicing Karma yoga, his mind is fully engaged in atman qualities, and this becomes a substitute for Gyana yoga.